This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX210, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI50 Standard Cylinder SI50AX210
The AirTAC Airtac SI50 Standard Cylinder SI50AX210 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 210mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX210, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke210 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX210
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI50 Standard Cylinder SI50AX210
The AirTAC SI50AX210 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 210mm stroke. Delivering 982N push and 825N pull at 0.5MPa, it is replaced by the SAI50AX210. This direct upgrade retains the exact G1/4 port, M16x1.5 rod thread, and mounting interface.
The SAI50AX210 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU lacks a magnet and cannot take a sensor, unlike legacy CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50AX210 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX210 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX210 |
| Bore size | Ø50 mm |
| Stroke | 210 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50AX210 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50AX210 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50AX210
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×210 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI50 Standard Cylinder SI50AX210 Is Used
Package Diverting
Actuates diverting arms on packaging lines, using the 982N push force at 0.5MPa to push cartons reliably onto adjacent conveyors.
Clamp Actuation
Provides repeatable clamping pressure for machining fixtures, where the 30mm adjustable air cushion ensures smooth end-of-stroke deceleration.
Replacing the Airtac SI50 Standard Cylinder SI50AX210 with the SAI50AX210
To replace the SI50AX210, order the SAI50AX210 and confirm the ISO 15552 mounting interface, 210mm stroke, and G1/4 port. Because this SKU lacks a magnet (-S), it cannot accept position sensors. If you need load holding, note the cushion only decelerates; use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For sizing, the 40mm bore yields 628N push, while the 63mm bore provides 1559N at 0.5MPa. The 210mm stroke requires checking side-load and rod-bending limits, using guide rails to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX210
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50AX210 FAQ
Yes, the SI50AX210 is discontinued. The direct replacement is the SAI50AX210, a current-production ISO 15552 cylinder that maintains the same 50mm bore, 210mm stroke, G1/4 port, and mounting interface for a seamless fixture swap.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. It delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX210
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX210 replacement — usually within 7-8 hours.